Low-power driver for XR-E

[Daekar]

I'm looking at the possiblity of building a few area lights with a premium-bin XR-E apiece, but I'm having trouble finding drivers that will provide outputs low enough... they're going to be for long power-outages. I'm thinking 3-modes spaced between 6 and 100 lumens... maxing out at 320mA or 350mA, anyway. Anybody have any suggestions? Am I better off with a 4-position switch and 3 different resistor values? I kind of would like to use a driver since they need to work with 4D alkalines and I would want to get as much power out of the cells as possible if necessary. Any suggestions?

 

[mpf]

Try this controller tutorial for beginners
http://www.candlepowerforums.com/vb/showthread.php?t=201383
which will let let you control the led current to very low levels just be increasing the sense resistor
matthew

 

[ambientmind]

What are you using for a power source? If its under 5v, you can use these drivers and just take two of the 7135 chips off for 350mA on high, with dimming and other functions.